Fig. 2From: Experimenting with Transmutation: Darwin, the Beagle, and EvolutionBothrops alternatus. The tip of the tail that attracted Darwin’s attention as “mark(ing) the passage” between the tails of adders and rattlesnakes is clearly shown in this photograph kindly provided by Dr. Pedro H. Bernardo of the Museu de Zoologia, Universidade de São PauloBack to article page